test for misc instance properties

test/unit/features/instance/properties.spec.js

@@ -0,0 +1,64 @@
+import Vue from 'vue'
+
+describe('Instance properties', () => {
+  it('$data', () => {
+    const data = { a: 1 }
+    const vm = new Vue({
+      data
+    })
+    expect(vm.a).toBe(1)
+    expect(vm.$data).toBe(data)
+    // vm -> data
+    vm.a = 2
+    expect(data.a).toBe(2)
+    // data -> vm
+    data.a = 3
+    expect(vm.a).toBe(3)
+  })
+
+  it('$options', () => {
+    const A = Vue.extend({
+      methods: {
+        a () {}
+      }
+    })
+    const vm = new A({
+      methods: {
+        b () {}
+      }
+    })
+    expect(typeof vm.$options.methods.a).toBe('function')
+    expect(typeof vm.$options.methods.b).toBe('function')
+  })
+
+  it('$root/$children', done => {
+    const vm = new Vue({
+      template: '<div><test v-if="ok"></test></div>',
+      data: { ok: true },
+      components: {
+        test: {
+          template: '<div></div>'
+        }
+      }
+    }).$mount()
+    expect(vm.$root).toBe(vm)
+    expect(vm.$children.length).toBe(1)
+    expect(vm.$children[0].$root).toBe(vm)
+    vm.ok = false
+    waitForUpdate(() => {
+      expect(vm.$children.length).toBe(0)
+      vm.ok = true
+    }).then(() => {
+      expect(vm.$children.length).toBe(1)
+      expect(vm.$children[0].$root).toBe(vm)
+    }).then(done)
+  })
+
+  it('$isServer', () => {
+    const vm = new Vue()
+    expect(vm.$isServer).toBe(false)
+    Vue.config._isServer = true
+    expect(vm.$isServer).toBe(true)
+    Vue.config._isServer = false
+  })
+})